Trigonometry

• The tangent function is the ratio of the opposite side to the adjacent side.
• The cosine function is the ratio of the adjacent side to the hypotenuse.
• The sine function is the ratio of the side opposite an angle to the hypotenuse.
• Trigonometric functions can be used to find missing sides or angles in right triangles using the Pythagorean theorem.
• The cotangent function is the reciprocal of tan(x).
• The secant function is the reciprocal of cos(x).
• In right triangles, the Pythagorean theorem states that c^2 = a^2 + b^2.